summaryrefslogtreecommitdiffstats
path: root/net/sched/sch_ingress.c
blob: 10adbc617905e4386becd7fe272ecad5f96ee086 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
/* net/sched/sch_ingress.c - Ingress and clsact qdisc
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 * Authors:     Jamal Hadi Salim 1999
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>

#include <net/netlink.h>
#include <net/pkt_sched.h>

static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
{
	return NULL;
}

static unsigned long ingress_get(struct Qdisc *sch, u32 classid)
{
	return TC_H_MIN(classid) + 1;
}

static unsigned long ingress_bind_filter(struct Qdisc *sch,
					 unsigned long parent, u32 classid)
{
	return ingress_get(sch, classid);
}

static void ingress_put(struct Qdisc *sch, unsigned long cl)
{
}

static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
{
}

static struct tcf_proto __rcu **ingress_find_tcf(struct Qdisc *sch,
						 unsigned long cl)
{
	struct net_device *dev = qdisc_dev(sch);

	return &dev->ingress_cl_list;
}

static int ingress_init(struct Qdisc *sch, struct nlattr *opt)
{
	net_inc_ingress_queue();
	sch->flags |= TCQ_F_CPUSTATS;

	return 0;
}

static void ingress_destroy(struct Qdisc *sch)
{
	struct net_device *dev = qdisc_dev(sch);

	tcf_destroy_chain(&dev->ingress_cl_list);
	net_dec_ingress_queue();
}

static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
{
	struct nlattr *nest;

	nest = nla_nest_start(skb, TCA_OPTIONS);
	if (nest == NULL)
		goto nla_put_failure;

	return nla_nest_end(skb, nest);

nla_put_failure:
	nla_nest_cancel(skb, nest);
	return -1;
}

static const struct Qdisc_class_ops ingress_class_ops = {
	.leaf		=	ingress_leaf,
	.get		=	ingress_get,
	.put		=	ingress_put,
	.walk		=	ingress_walk,
	.tcf_chain	=	ingress_find_tcf,
	.bind_tcf	=	ingress_bind_filter,
	.unbind_tcf	=	ingress_put,
};

static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
	.cl_ops		=	&ingress_class_ops,
	.id		=	"ingress",
	.init		=	ingress_init,
	.destroy	=	ingress_destroy,
	.dump		=	ingress_dump,
	.owner		=	THIS_MODULE,
};

static unsigned long clsact_get(struct Qdisc *sch, u32 classid)
{
	switch (TC_H_MIN(classid)) {
	case TC_H_MIN(TC_H_MIN_INGRESS):
	case TC_H_MIN(TC_H_MIN_EGRESS):
		return TC_H_MIN(classid);
	default:
		return 0;
	}
}

static unsigned long clsact_bind_filter(struct Qdisc *sch,
					unsigned long parent, u32 classid)
{
	return clsact_get(sch, classid);
}

static struct tcf_proto __rcu **clsact_find_tcf(struct Qdisc *sch,
						unsigned long cl)
{
	struct net_device *dev = qdisc_dev(sch);

	switch (cl) {
	case TC_H_MIN(TC_H_MIN_INGRESS):
		return &dev->ingress_cl_list;
	case TC_H_MIN(TC_H_MIN_EGRESS):
		return &dev->egress_cl_list;
	default:
		return NULL;
	}
}

static int clsact_init(struct Qdisc *sch, struct nlattr *opt)
{
	net_inc_ingress_queue();
	net_inc_egress_queue();

	sch->flags |= TCQ_F_CPUSTATS;

	return 0;
}

static void clsact_destroy(struct Qdisc *sch)
{
	struct net_device *dev = qdisc_dev(sch);

	tcf_destroy_chain(&dev->ingress_cl_list);
	tcf_destroy_chain(&dev->egress_cl_list);

	net_dec_ingress_queue();
	net_dec_egress_queue();
}

static const struct Qdisc_class_ops clsact_class_ops = {
	.leaf		=	ingress_leaf,
	.get		=	clsact_get,
	.put		=	ingress_put,
	.walk		=	ingress_walk,
	.tcf_chain	=	clsact_find_tcf,
	.bind_tcf	=	clsact_bind_filter,
	.unbind_tcf	=	ingress_put,
};

static struct Qdisc_ops clsact_qdisc_ops __read_mostly = {
	.cl_ops		=	&clsact_class_ops,
	.id		=	"clsact",
	.init		=	clsact_init,
	.destroy	=	clsact_destroy,
	.dump		=	ingress_dump,
	.owner		=	THIS_MODULE,
};

static int __init ingress_module_init(void)
{
	int ret;

	ret = register_qdisc(&ingress_qdisc_ops);
	if (!ret) {
		ret = register_qdisc(&clsact_qdisc_ops);
		if (ret)
			unregister_qdisc(&ingress_qdisc_ops);
	}

	return ret;
}

static void __exit ingress_module_exit(void)
{
	unregister_qdisc(&ingress_qdisc_ops);
	unregister_qdisc(&clsact_qdisc_ops);
}

module_init(ingress_module_init);
module_exit(ingress_module_exit);

MODULE_ALIAS("sch_clsact");
MODULE_LICENSE("GPL");